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6.2 Exercise 15

Avg difficulty 2.5

In the United States the ages 13 to 55+ of smartphone users approximately follow a normal distribution with approximate mean and standard deviation of 36.9 years and 13.9 years, respectively. Using this information, answer the following questions. —Round answers to one decimal place.

b. Forty percent of the ages that range from 13 to 55+ are at least what age?

OpenStax Statistics, 6.2 Using the Normal Distribution, exercise 15

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Adapted from Statistics © 2022 Rice University. Licensed under CC BY 4.0. Source: Statistics. Imported at revision 7dea80a.